@article{AUCMP_1987_28_2_a20,
     author = {Zaj{\'\i}\v{c}ek, L.},
     title = {Strict differentiability via differentiability},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {157--159},
     year = {1987},
     volume = {28},
     number = {2},
     mrnumber = {0932752},
     zbl = {0646.46037},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_1987_28_2_a20/}
}